Ratings

This game was being developed by Production Studio 4 alongside Resident Evil and was announced in 2002 as part of the CAPCOM Five agreement.[1] In the West it is otherwise known as the "Fog" or "Mist" version, and is recognized as such by developers.

Over time Leon was to discover the origins of the Progenitor Virus. In the backstory, it was found in the corpse of an ancient human by archaeologists exploring the castle, and gave Spencer the ambition to begin his virus research.

A sideplot is said to have involved a female partner character waking up from her sleep in the castle and exploring it with her B.O.W. dog.

One of the most notable areas shown in this version was a flying airship.

Castle ran into various problems during its development, resulting in its scrapping. One of the often-cited examples is the "Black Fog" enemy, which is said to have been impossible to properly animate with the technology of the time. Capcom would only succeed with such animation when animating the Uroboros enemies of Resident Evil 5.

Eventually it was decided the scenario should be thrown out to allow the team to start again. Noboru Sugimura left the project, donating his scenario draft to Production Studio 3, who were interested in creating a horror game with a female protagonist, later titled "Demento" (titled as "Haunting Ground" in US/EU). Leon's story was removed to give the "girl and dog" more focus, becoming Fiona and Hewie.